Other Parts Discussed in Thread: DAC104S085, SYSBIOS
Hello.
I'm trying to develop devicetree for custom AM3357 based board.
I've encountered strange problem, any device driver declared as 5th child of SPI1, is not able to communicate over SPI.
I can see that CS is driven as usually, but no CLOCK, no MOSI activity at all.
I have checked that if I change order of cs-gpios and modify reg accordingly, this driver works great, and another, which is on 5th CS stops working and behaves as described.
I have attached part of my DTS, however this problem looks to be more general.
From my point of view, expected result is that I can declare as many child drivers as needed.
&am33xx_pinmux {
pinctrl-names = "default";
spi1_pins: pinmux_spi1_pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x90c, PIN_INPUT | MUX_MODE2) /* (H17) gmii1_crs.spi1_d0 */
AM33XX_IOPAD(0x910, PIN_INPUT | MUX_MODE2) /* (J15) gmii1_rxer.spi1_d1 */
AM33XX_IOPAD(0x964, PIN_INPUT | MUX_MODE4) /* (C18) eCAP0_in_PWM0_out.spi1_sclk */
AM33XX_IOPAD(0x978, PIN_INPUT | MUX_MODE7) /* (D18) uart1_ctsn.gpio0[12] */
AM33XX_IOPAD(0x97c, PIN_INPUT | MUX_MODE7) /* (D19) uart1_rtsn.gpio0[13] */
AM33XX_IOPAD(0x8f4, PIN_INPUT | MUX_MODE7) /* (H18) mmc0_dat2.gpio2[27] */
AM33XX_IOPAD(0x8f8, PIN_INPUT | MUX_MODE7) /* (H17) mmc0_dat1.gpio2[28] */
AM33XX_IOPAD(0x8fc, PIN_INPUT | MUX_MODE7) /* (G18) mmc0_dat0.gpio2[29] */
>;
};
};
&spi1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&spi1_pins>;
cs-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>,
<&gpio0 13 GPIO_ACTIVE_LOW>,
<&gpio2 27 GPIO_ACTIVE_LOW>,
<&gpio2 29 GPIO_ACTIVE_LOW>,
<&gpio2 28 GPIO_ACTIVE_LOW>;
spi-max-frequency = <60000000>;
slot1: gpio@0 {
compatible = "microchip,mcp23s17";
#gpio-cells = <2>;
gpio-controller;
reg = <0>;
microchip,spi-present-mask = <0x01>;
spi-max-frequency = <10000000>;
#interrupt-cells = <2>;
};
slot2: adc@1 {
compatible = "ti,ads7957";
reg = <1>;
#io-channel-cells = <1>;
spi-max-frequency = <1000000>;
vref-supply = <&vref_3v3>;
};
slot3: dac@2 {
compatible = "ti,dac104s085";
reg = <2>;
spi-max-frequency = <10000000>;
spi-cpol;
vref-supply = <&vref_3v3>;
};
slot6: adc@3 {
compatible = "ad7923";
reg = <3>;
spi-max-frequency = <1000000>;
refin-supply = <&vref_3v3>;
#address-cells = <1>;
#size-cells = <0>;
spi-cpha;
};
slot5: dac@4 {
compatible = "ti,dac104s085";
reg = <4>;
spi-max-frequency = <10000000>;
spi-cpol;
vref-supply = <&vref_3v3>;
};
};
